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std::function::target_type

STD：：功能：目标[医]类型

const std::type_info& target_type() const;​(since C++11)

返回存储函数的类型。

参数

%280%29

返回值

typeid(T)如果存储的函数有类型T，否则typeid(void)...

例外

noexcept规格：

noexcept

例

二次

#include <functional>
#include <iostream>
 
int f(int a) { return -a; }
int main()
{
    // fn1 and fn2 have the same type, but their targets do not
    std::function<int(int)> fn1(f),
                            fn2([](int a) {return -a;}
    std::cout << fn1.target_type().name() << '\n'
              << fn2.target_type().name() << '\n';
}

二次

可能的产出：

二次

int (*)(int)
main::$_0

二次

另见

targetobtains a pointer to the stored target (public member function)

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http：//en.cppreference.com/w/cpp/实用程序/Functional/FunctionalTarget[医]类型

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